Eye-protective glass



Patented 2, Pal r 1 WILLIAM WEBER ooernn'rz,

9F WASHINGTON, DZSTEICT OF COLUMBIA, fASdEGNGE 339 SEGRETKBY GE COMMERCE 6F THE UNITED; STATES, AS TRUSTEE FUR THE 'V-i nannnn'r or one human snares also THE PEQ'ELE Ol TEE 'UNXTED STATES.

r'rn-rnornornw. eases.

Io Brewing.

Application filed June CW, 192%. serial lilo. 118,131).

(GEANEEE UZQBEE AGE @F HABCE 3, 1383; hit 2.625.)

especially suitable for protective glasses 1n excluding harmful light or heat rayswhile permitting the transmission of other portions of the spectrum, and providing in the case of certain optical glasses ample vision;

also for other purposes Where it is desirable to exclude theultra 'violetand certain other rays while permitting the passage of still- 90 others.

The obJects of my inventionare, among others:

First. to provide a glass that when used in speqtacles or eye protectors will prevent in .jury to the eye from ultra-violet rays;

Second, to provide a glass that will permit clear vision;

. Third, to provide a glass that will be blue in color, and particularly of a cobalt blue hue;

' Fourth, to provide a single glass that will absorb the ultra-violet rays while still retaining the blue color of cobalt. (Where l have used the ternis single glass T mean one that contains all the constituents in one melt) an integral glass; that is to say,

- Fifth, to rovide a glass which may become or sets lish a standard of color and ul- 7 tra-violet absorption, especially for furnace 40 operators; 1

Sixth, to simplify the construction of optical glasses and other scientifioinstruments and commercial articles such as containers, etc.; l'

Seventh, to cheapen the construction of such objects. a I

Colored glasses have been usedfor years to protect the eye when looking at bright lights or into furnaces, but these glasses 5 have not given the proper protection; or if protection has been given, then they, have not heretofore possessed other desirable characteristics, such as proper and preferred color, ample visibility, do.

Although such glasses do reduce the intensity of the transmitted light, they do not;

absorb or cut out the harmful ultra-violet rays. Where glasses have been used which have absorbed such rays,.they have failed to give sufiicient vision in other respects or permit the passage of other portions of the spectrum to the desired degree. Moreover, in certain industries a glass ofblue color preferably of cobalt origin is desired, and

heretofore regardless of the fact that such, glass byitself gives only partial, if any,

protection against the harmful ultra-violet rays, the workers in such industries have persisted in using such glasses maintaining that they can observe furnace conditions better through a blue rather than through other colored glasses which do give the protection.

This prejudice is probably in part due to their greater experience with a blue glass. Tn any event, although absorption glasses have been used which, to a degree, eliminate the harmful, rays, theyhave noticed the dc sired color of cobalt blue, and, in so far as T am aware, no single glass has heretoforebeen made which combines the necessary constituents so as to give the desired com bined characteristics of a cobalt blue color, suficient clarity of vision of objects observed therethrough, and adequate ultraviolet ray absorption.

I have found that glass containing cerium oxide transmits practically all of the visible spectrum and absorbs the harmful ultraviolet rays.

If cobalt oxide which produces the desired blue color and permits suficient vision, togetherwith other advantages, is combined in the same melt-that is to say, introduced into the same glass-with cerium oxide, the resultant glass will exhibit the characteristics of each of the said ingredients and com-.

requirements of safety engineers for a -'nonactinic glass, will be met.

By my invention 1 have succeeded in accomplishing this result. I have found that by using the following constituents and pre-= Till CeO ferred proportions I have obtained a composition of matter producing a glass in one melt having the desired cobalt blue color, the wished for visible spectrum transmission quality, ample visibility and the necesssary absorption of harmful ultra-violet rays:

Per cent. SiO 69.5 CaO 6.8 C00 0.1 Na O 17.6

The glass melted and fined readily at 1425 C., and worked easily. The apparent color of the glass was so similar to the sim plecobalt glass that it was possible to differentiate visual inspection.

ile I prefer cerium as an ultra-violet ray absorption agent, I have found that lead oxide, uranium oxide and certain other oxides will to a certain degree also absorb the ultra-violet rays, and I believe that my invent-ion is broad enough to cover the use of such substances in place of cerium oxide. Moreover, I do not wish to be limited to the exact proportion or the exact ingredients set forth above, which is my typical and preferred combination, as certain of these ingredients may be omitted or replaced by others of similar nature and theproportions within limits may be varied. In other Words, while I have found that the ingredients and proportions above mentioned give the desired results, and I prefer them, I do not wish to be limited to the use of all of these ingredients, to these exact ingredients and no others, nor the exact proporbetween them by practically im-,.

t-ions set forth above, as the omission of some elements of the admixture or presenceof small quantities of other ingredients or a slight variation, of proportions will not adversely affect the final product, although it may vary somewhat the relative characteristics of the products resulting from'such 2. As a new article of manufacture a glass containing the usual glass-making constituen s and sufiicient cobalt oxide togive a blue color equivalent to blue 20+8 on the Lox'i-bond scale, and sufficient cerium oxide to stop the ultra-violet rays;

3. As a new article of manufacture a glass containing the usual glass-making constituents and sufficient cobalt oxide to give a blue color equivalent to blue 20+8 on the Lovibond scale, sufficient cerium oxide to stop the ultra-violet rays and to absorb the majority of the inframedrays,

4. As a new article of manufacture a glass containing the iusual glass-making constituents and sufiicient cobalt oxide to "give a blue color equivalent to blue 20+8 on the Lovibond scale, sufficient cerium oxide to stop the ultra-violet rays and to absorb'the majority of the infra-red rays while permitting the transmission of approximately 1% per cent of visible light.

WILLIAM WEBER COBLENTZ. 

